refactor: scaffolded odin project with CLI parser, version command, Go fallback

features.odin

@@ -0,0 +1,45 @@
+package main
+
+import "core:os"
+import "core:strings"
+
+Feature :: enum {
+	Git,
+	Fd,
+	Age,
+}
+
+AvailableFeatures :: bit_set[Feature]
+
+check_features :: proc() -> AvailableFeatures {
+	feats: AvailableFeatures
+
+	if find_binary("git") != "" {
+		feats += {.Git}
+	}
+	if find_binary("fd") != "" {
+		feats += {.Fd}
+	}
+	if find_binary("age") != "" {
+		feats += {.Age}
+	}
+
+	return feats
+}
+
+find_binary :: proc(name: string) -> string {
+	path_env := os.get_env("PATH", context.allocator)
+	paths := strings.split(path_env, ":")
+	for p in paths {
+		candidate := strings.join({strings.trim_right(p, "/"), name}, "/")
+		_, err := os.stat(candidate, context.allocator)
+		if err == nil {
+			return candidate
+		}
+	}
+	return ""
+}
+
+has_feature :: proc(feats: AvailableFeatures, f: Feature) -> bool {
+	return f in feats
+}